Lens-slitting device.



A. L. SANDERSON. LENS SLITTING DEVlCE. APPLICATION FILED NOV. 5. 1915.

Patented Aug. 29, 1916.

ATTORNEY ALVA L. SANDERSON, OF KANSAS CITY, MISSOURI.

LENS-SLITTING DEVICE.

Specification of Letters Patent.

Patented Aug. 29, 1916.

Application filed November 5, 1915. Serial No. 59,744.

To all whom it may concern:

.Be it known that I, ALVA L. SANDERSON, a vcitizen of the United States,residing at Kansas City, in the county of Jackson and State of Missouri,have invented certain new and useful Improvements in Lens-SlittingDevices; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

My invention relates to apparatus for slitting eyeglass or spectaclelenses, and more particularly to an apparatus for forming slots thereinthat will adapt the lenses for use with screwless mountings, theprincipal object of the invention being to provide a combination ofgrinding tool and lens hold- ,ing parts, whereby the lens maybeaccurately and conveniently moved against the grinding member toproperly locate the slot. In accomplishing this and other objects of theinvention I have provided improved details of structure, the preferredforms of which are illustrated in the accompanying drawings, wherein:

Figure I is a perspective view of a lensslitting apparatus embodying myimprovements. Fig. II is a side elevation of the grinding tool. Fig. IIIis a vertical section on the line III-III, Fig. 11. Fig. IV is a detailperspective view of the lens cup.

Fig. V is a plan view, particularly illustrating the offset guide slotin the cup.

Referring more in detail to the drawings: 1 designates the frame of agrinding tool, which is preferably formed in U-shape, so that it may belocated over the edge of a table or the like, and is provided with ascrew clamp 2 whereby the frame may be securely attached to the table.The frame 1 carries a table 4: having slots 5-6 near the longitudinaledges thereof, and journaled in a bearing 8, formed in the body of theframe, is a shaft 9, having a pulley wheel 10 fixed on one end thereofand provided with a handle 11 whereby the wheel and shaft may berevolved. The pulley is preferably V-shaped to take a round belt 12whereby the shaft may be driven from a suitable motor, if desired.

Fixed on the shaft 9 is a slitting stone 14, of such thickness that itwill grind a slot of desired width in a lens when the lens s movedthereagainst, the said stone 14 being projected through the slot 5 inthe table 4, so that a part thereof will revolve about the table. Alsofixed on the shaft 9 is a trimming stone 15 which 'is preferably thickerthan the stone 14 and is arranged to pro ect through the slot 6 in thetable, so that a lens may be supported on the table and moved againstthe trimming stone to'remove sharp corners from the lens after the lenshas been formed. The stone l l'preferably runs in a bath of watercontained within a vessel 17 that is fixed to the side of the frame.

In order to insure proper location of the when a lens is located in thecup and the cup moved on the table in the direction of the stone 14 thestone will project through the slot 21 and 22, and engage the lens togrind the slot therein. At the opposite end of the cup 18 is a similarslot 23-24, which is located at one side of the center but extendedparallel with the major axis of the cup, but at one side thereof, sothat a lens located in the cup may be slotted at one side of the majoraxis of the lens in order to provide a suspended mounting for the lenson the finished eyeglass or spectacle.

In order that a lens may be conveniently removed from the cup I providean opening 19' in the bottom of the cup, through which an operator maypush the lens from its seat in the cup.

In order that an operator may properly guide the lens toward theslotting stone and for convenience in handling a cup during the grindingoperation, I locate the slots in the table such a distance from thelongitu dinal edge of the table, so as to leave a margin at the side ofthe cup when the latter is moved toward the stone, and the table is ofsuch length that the cup will pro ect thereover in the direction of theoperator at all times during the slotting operation, so that when theoperator places the cup on the table and moves the same toward thestone, he guides the movement by the adjacent longitudinal edge of thetable and may grasp the cup from beneath without interference from thetable itself.

Assuming the apparatus to be constructed and assembled as described, theoperator places a lens in the cup 18 and starts the shaft 9 inoperation. He then places the cup on the table and grasps the outer endof the cup and the lens, so that the latter 1S kheld firmly in the cupand moves the cup along the table, in guided relation to thelongitudinal edge and until the slotted part of the cup is projectedover the stone. For ward pressure on the cup-and lens then moves thelatter toward the stone, so-that the edge of the stone grinds into thelens and forms a. slot therein, the length of the slot in the lens beinglimited by the length of the slot 21 in the bottom of the cup. If thelens is to be ground along its major axis the end of the cup having theslot 21-22 is moved toward the stone, but if a suspended lens isdesired, then the end of the cup containing the slot 2324-is'moi'ed-towardthe stone, so that the stone will grind through the slot23-24 and form the slot in the lens at one side of the major axis of thelens. After the slot has been formed in the lens, should there be anyrough edges, the lens may be placed against the stone andthe sharpcorners ground ofi'.

Having thus described my invention, What as a I claim as newtherein,-and desire tosecure by Letters-Patent, is:

1. In an apparatus of the character described, a lens cup comprising abottom member and an edge flange, having slots in substantial alinementwith the longitudinal axis of the cup, for the purpose set forth.

2. In an apparatus of the character described, a lens cup comprising abottom "member and an edge flange, having slots in substantial alinementwith the longitudinal axis of the cup, and having slots in the oppositeend at one side ofthe major axis, for

the purpose set forth.

3. In an apparatusof the'character (he 1 c en up comprising] a b ttmember and anedge flangqhmii gi lgt 1 substantial alinement withthlongitndinal axis of the cup, 'andfhaving" an aperture in said bottom"member, for -the purpoesetv forth.

in I ALVA L. SANDERSONE G. H. S'rURnrvAN, W. B. HOMER.

, Intestimon r vhereof I ailixmj signatuge I

